基于调制方案的抗投影变换数字水印算法  

A digital watermarking algorithm against projection transformation based on modulation scheme

作　　者：杨辉[1] 闵连权[1] 侯翔[1] 

机构地区：[1]信息工程大学地理空间信息学院,郑州450000

出　　处：《测绘科学》2015年第4期19-22,共4页Science of Surveying and Mapping

摘　　要：针对传统数字水印算法无法抵抗投影变换攻击的问题,该文提出了一种对投影变换具有较高鲁棒性的数字水印算法。结合投影变换具有拓扑关系不变性以及在小范围内近似等特点,该文选择定位点和经纬线网格之间的包含关系作为水印载体,通过修改包含关系嵌入水印。实验证明该方法不仅对多种投影变换具有鲁棒性,而且能够抵抗裁剪、压缩等常见攻击,算法能够有效提高对矢量地图数据版权保护的能力。Most watermarking algorithm of the vector map data are ineffective for the projection transformation attack,and a watermarking algorithm which was robust against the map projection transformation was designed in this paper.Based on the invariance of topologic relationshape of the projection transformation and the character of the modulation algorithm,the inclusion relation between the geographic grid and the coordinate points was selected as the watermark carrier,and the watermark was embedded by modifying the inclusion relation.Experimental results showed that this algorithm was robust against not only the projection attaction,but also the crop attack and compression attack,which could improve the copyright protection ability of vector map data.

关 键 词：数字水印 拓扑关系 调制 投影变换 鲁棒性 

分 类 号：P282.1[天文地球—地图制图学与地理信息工程]